This depends a lot on if it is a pressure or vacuum on the tank. The exhaust heating the tank is feasible but if the same problem is happening after only a few seconds of running then that is likely not the problem. I think there is a vent problem for the tank. The tank should always be at the same pressure as the air around truck. If there is a vacuum it is because there is not enough venting to the tank. Most of the venting occurs through the charcoal canister. If the tank is not venting, as the engine runs it will draw a vacuum on the tank. If the vacuum is high enough it is probably pulling vacuum through the canister. The canister is connected to the tank and the fuel system to catch vapors from the system so they don't get released to the environment. Hence, if the canister is clogged, the vacuum will pull through the canister, through the fuel system, back to the fuel pick-up line from the tank, and dump it through the overflow. An easy check is disconnect all of the lines on the charcoal canister, put the cap back, and see if the problem persists. If it does not, replace the canister.

One million microphones is just a phone, not a megaphone. Micro = .000001 (10^-6). Mega = 1000000 (10^6). So... 1000000*.000001 phone = 1 phone Keep up the good work, but check it first!

Greetings, wise ones. I would like to submit a correction to one of the arithmetic conversions from the metric system. The first conversion was “What is one million microphones in the metric system?” The answer was given as a megaphone, but that would incorrect from a metric standpoint. It is correct that a million in the metric system is represented by the prefix “mega”, but the prefix “micro” is also a metric prefix, for one millionth. Thus a “microphone” is one one-millionth of a phone. If we have a million of these one-millionth phones, we end up with a single phone. Another way to look at it is from a fraction standpoint: 1 phone 1,000,000 ----------- X ----------- 1,000,000 1 The 1,000,000’s will cancel and we’re left with 1 phone.

There may have been mud chiggers in the fuel line, but they probably made it to the gas cap too! It sounds like the vented cap is no longer vented. Buy a new cap and try that out before going to any other expense.

You guys really missed it and it could be extremely dangerous. I hope you can contact her and tell her to TOW it back to the shop. I had a similar issue years ago with a Ford ambulance conversion building up pressure in the fuel tank. They were nicknamed the Flaming Coffin. Cause is heat from the exhaust system raising the temp/pressure in the fuel tank. Heat = expansion = pressure. Whether the exhaust is leaking from her bad exhaust pipe, or a heat shield was left off by the boneheads who worked on it for her should be easy to discover.

You spent (wasted) so much time perplexed over the leaking gas on behalf of the junior legal intern in N'Ahlins, you COULD HAVE (should have) spent at least a couple of those seconds letting Drusinao tell us the history of his name!

Nancy's problem is not with her positive battery cable, and the ant analogy is close to spot on. The Nissan has a grounding issue that is affected during extreme cold weather due to contraction. By turning on the heater and having the ignition turned on, a ground path is provided to the starter relay allowing the proper bias for positive to be passed to the starter. Similar to the ant analogy, the heater switch is 'bridging' a ground to the starting circuitry. Check the ground wires. The heater switch applies a ground, not +12 volts.